A comb plate expansion and disengagement device

Abstract

The present application relates to the field of aeronautical manufacturing engineering, and particularly relates to a rack-and-pinion disc expanding and separating device, which comprises a workbench, a pulling device and a refrigerant filling device; the workbench is used for mounting and fixing a compressor rotor; the pulling device comprises an outer extrusion component, an inner deformation component and an extension mechanism, the inner deformation component is connected with the workbench through the extension mechanism, an annular boss is arranged on the inner deformation component, the annular boss has a cavity inside, and the outer extrusion component is sleeved on the annular boss and is in interference fit with the annular boss; the refrigerant filling device is communicated with the cavity inside the annular boss through a pipeline. The present application has the advantages that refrigerant is filled into the inner deformation component, so that the overall size of the inner deformation component and the outer extrusion component is shrunk, the size-shrunk outer extrusion component can be put into a stop opening of the rack-and-pinion disc, after the refrigerant volatilizes, the inner deformation component restores to normal temperature and expands, so that the outer extrusion component abuts against the stop opening of the rack-and-pinion disc, and the rack-and-pinion disc is pulled and separated.

Description

Technical Field

[0001] This invention relates to the field of aerospace manufacturing engineering, and in particular to a toothed disc expansion and disengagement device. Background Technology

[0002] The aircraft engine is the core component of an aircraft. During the maintenance of an aircraft engine, it is necessary to disassemble the engine. The grating disc is the last stage of the compressor rotor assembly of the engine. It is installed by heating and pressing during assembly, but disassembly is extremely difficult. The main reason is that the outer grating surface of the grating disc is a thin-walled structure, which is easily deformed and damaged under stress. Therefore, it cannot be used as a stress-bearing surface for disassembly. Furthermore, the axial distance between the inner center hole of the grating disc and the center of the previous stage rotor is extremely limited. This results in insufficient strength and rigidity due to space constraints in the design of the puller, leading to serious damage and very low disassembly efficiency. In some cases, multiple sets of pullers break in succession, but the grating disc still cannot be disassembled. At the same time, the operation is risky, and the grating disc is easily scratched, bumped, and damaged during the disassembly process. Summary of the Invention

[0003] The purpose of this invention is to overcome the shortcomings of the prior art and provide a toothed disc expansion and disengagement device.

[0004] The objective of this invention is achieved through the following technical solution: a toothed disc expansion and release device, comprising a worktable, a pulling device, and a refrigerant injection device; the worktable is used to install and fix a compressor rotor; the pulling device includes an outer extrusion component, an inner deformation component, and a telescopic mechanism, the inner deformation component being connected to the worktable via the telescopic mechanism, the inner deformation component being provided with an annular boss, the annular boss having a cavity inside, the outer extrusion component being sleeved on the annular boss and having an interference fit with the annular boss, the outer extrusion component being used to connect to the toothed disc; the refrigerant injection device being connected to the cavity inside the annular boss via a conduit.

[0005] This invention injects a refrigerant into the cavity of the annular boss on the inner deformable component using a refrigerant injection device. This causes the inner deformable component to contract upon cooling. After contraction, the interference fit between the inner deformable component and the outer extrusion component changes from a room temperature fit to a clearance fit. This removes the radial thrust from the inner deformable component, causing the outer extrusion component to contract further. At this point, the outer extrusion component can be placed into the stop of the grate disc on the compressor rotor, which is mounted and fixed on the worktable. The inner deformable component then expands back to room temperature, forming an interference fit with the outer extrusion component again. This causes the outer extrusion component to expand. After expansion, the outer extrusion component forms an interference fit with the grate disc, and the contact pressure between the outer extrusion component and the grate disc is greater than the contact pressure between the grate disc and the compressor rotor. Finally, the grate disc is separated from the compressor rotor by the pulling of the telescopic mechanism.

[0006] In some embodiments, the annular boss is disposed at the bottom of the inner deformable member, and the top of the inner deformable member is provided with a plurality of openings communicating with the internal cavity of the annular boss. The openings facilitate the rapid vaporization and evaporation of the refrigerant inside the cavity of the annular boss, so that the inner deformable member can return to normal temperature.

[0007] In some embodiments, the outer extrusion component includes, from top to bottom, a connecting flange, a sleeve, and an extrusion flange. The outer extrusion component is bolted to the inner deformable component via the connecting flange and is fitted onto the annular boss via the sleeve with an interference fit. The extrusion flange is used to connect the toothed disc. Connecting the outer extrusion component and the inner deformable component via the connecting flange prevents the outer extrusion component from detaching after the inner deformable component shrinks due to cooling.

[0008] In some embodiments, the workbench includes a support plate, a plurality of support columns disposed on the support plate, and a hanging plate disposed on the support columns. The support plate may also be detachably provided with a centering sleeve for connecting the compressor rotor, and the telescopic mechanism is connected to the hanging plate.

[0009] In some embodiments, the telescopic mechanism includes a screw and a wrench. A telescopic hole is provided on the mounting plate, the screw passes through the telescopic hole, and the wrench is threadedly connected to the screw. The wrench is located at the top of the mounting plate, and the bottom end of the screw is connected to the inner deformable component. Axial movement of the screw is achieved by rotating the wrench.

[0010] In some embodiments, the refrigerant filling device includes a refrigerant reservoir, a filling pipeline, and a one-way pump. The two ends of the filling pipeline are respectively connected to the conduit and the refrigerant reservoir, and the one-way pump is disposed on the filling pipeline. The one-way pump fills the cavity of the annular boss of the inner deformable component with refrigerant.

[0011] In some embodiments, the refrigerant filling device further includes a controller electrically connected to the unidirectional pump. The controller controls the start and stop of the unidirectional pump to control the flow rate and filling amount of the refrigerant.

[0012] In some embodiments, a filter is installed on the filling line between the refrigerant storage tank and the one-way pump. A flow regulator and a safety valve assembly are sequentially installed on the filling line between the one-way valve and the conduit. The flow regulator is electrically connected to the controller. The filter filters the refrigerant flowing through the one-way pump, extending the pump's lifespan. The controller controls the flow regulator and the one-way pump to jointly regulate the flow rate and filling amount of the refrigerant.

[0013] In some embodiments, the safety valve assembly includes a relief valve and a shut-off valve arranged in parallel. The safety valve assembly provides safety protection and pressure control during the refrigerant filling process.

[0014] In some embodiments, the filling pipeline has a venting structure at one end near the conduit via a tee fitting. The venting structure includes a vent valve and a vent port connected in sequence. The venting structure allows the refrigerant in the filling pipeline to vaporize and evaporate, thus discharging the refrigerant.

[0015] The present invention has the following advantages:

[0016] At room temperature, the annular boss on the inner deformable component has an interference fit with the outer extrusion component, and the outer extrusion component is subjected to radial thrust from the inner deformable component. By injecting refrigerant into the cavity of the annular boss on the inner deformable component through a refrigerant injection device, the inner deformable component cools down. After being frozen, the inner deformable component shrinks, and the interference fit between the annular boss and the outer extrusion component changes to a clearance fit. The outer extrusion component is no longer subjected to radial thrust from the inner deformable component, and its size shrinks. At this point, the outer extrusion component can be placed into the stop of the grate disc. After the refrigerant vaporizes and evaporates, the inner deformable component returns to room temperature and expands, forming an interference fit with the outer extrusion component again. This expansion further creates an interference fit between the outer extrusion component and the stop of the grate disc, with the contact pressure between the outer extrusion component and the stop of the grate disc being greater than the contact pressure between the grate disc and the compressor rotor. Finally, the grate disc is pulled off by a telescopic mechanism. This invention achieves a stable connection between the outer extrusion component and the grate plate by forming an interference fit, ensuring uniform force distribution on the grate plate and preventing scratches and bumps. At the same time, it does not affect the temperature of the grate plate, thus avoiding damage to its microstructure. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of the toothed disc expansion and disengagement device of the present invention;

[0018] Figure 2 This is a schematic diagram of the structure of the drawing device of the present invention;

[0019] Figure 3 This is a schematic diagram of the structure of the worktable of the present invention;

[0020] Figure 4 This is a schematic diagram of the internal structure of the refrigerant filling device of the present invention;

[0021] In the diagram: 11. Support plate; 12. Support column; 13. Hanging plate; 14. Centering sleeve; 15. Support base column; 21. Inner deformable component; 211. Annular boss; 212. Opening; 22. Outer extrusion component; 221. Connecting flange; 222. Sleeve; 223. Extrusion flange; 231. Screw; 232. Wrench; 3. Refrigerant filling device; 31. Refrigerant storage device; 32. Filling pipeline; 33. One-way pump; 34. Filter; 35. Flow regulator; 36. Shut-off valve; 37. Overflow valve; 38. Drain valve; 39. Drain port; 4. Conduit; 5. Grate disc; 6. Controller. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only for explaining the invention and are not intended to limit the invention; that is, the described embodiments are merely some embodiments of the invention, and not all embodiments. The components of the embodiments of the invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0023] The present invention will be further described below with reference to the accompanying drawings, but the scope of protection of the present invention is not limited to the following description.

[0024] like Figures 1-4 As shown, a toothed disc expansion and release device includes a worktable, a pulling device, and a refrigerant filling device 3. The worktable is used to install and fix the compressor rotor. The pulling device includes an outer extrusion component 22, an inner deformation component 21, and a telescopic mechanism. The inner deformation component is connected to the worktable through the telescopic mechanism. An annular boss 211 is provided on the inner deformation component 21. The annular boss 211 has a cavity inside. The outer extrusion component 22 is sleeved on the annular boss 211 and is press-fitted with the annular boss 211. The outer extrusion component 22 is used to connect the toothed disc 5. The refrigerant filling device 3 is connected to the cavity inside the annular boss 211 through a conduit 4.

[0025] Specifically, in this embodiment, the annular boss 211 on the inner deformable component 21 has a rectangular cross-section, and the outer extrusion component 22 is sleeved on the outer wall of the inner deformable component 21, with an interference fit between the outer extrusion component 22 and the annular boss 211. A conduit 4 is connected to the inner deformable component 21. The conduit 4 is an antifreeze conduit, with one end connected to the cavity inside the annular boss 211 and the other end connected to the refrigerant filling device 3. When using this device, first connect the compressor rotor to the workbench with bolts. The compressor rotor and the telescopic path of the telescopic mechanism are coaxial. The grate disc 5 faces the outer extrusion component 22. At room temperature, the size of the stop of the grate disc 5 is slightly smaller than the size of the outer extrusion component 22, and the outer extrusion component 22 cannot directly mate with the stop of the grate disc 5. During operation, the refrigerant injection device 3 injects refrigerant into the cavity of the annular boss 211 through the conduit 4, which cools down the inner deformable component 21. After cooling down, the inner deformable component 21 shrinks in size, and the annular boss 211 on the inner deformable component 21 and the outer extrusion component 22 change from an interference fit to a clearance fit. The inner deformable component 21 no longer exerts radial thrust on the outer extrusion component 22. This causes the outer extrusion component 22 to shrink in size. At this time, the outer extrusion component 22 can engage with the stop of the grate disc 5. The telescopic mechanism pushes the outer extrusion component 22 into the stop of the grate disc 5. Then, while waiting for the inner deformation component 21 to return to normal temperature, the annular boss 211 re-forms an interference fit with the outer extrusion component 22. The annular boss 211 exerts a radial thrust on the outer extrusion component 22, causing the size of the outer extrusion component 22 to increase. This further causes an interference fit between the outer extrusion component 22 and the stop of the grate disc 5, and the contact pressure between the outer extrusion component 22 and the stop of the grate disc 5 is greater than the contact pressure between the grate disc 5 and the compressor rotor. Then, the telescopic mechanism pulls the grate disc 5 to separate it from the compressor rotor. In this embodiment... This invention reduces the temperature impact of the freezing medium on the grate disc 5 by incorporating an inner deformation component 21 and an outer pressing component 22, thus preventing damage to the metal microstructure of the grate disc 5. Simultaneously, the outer pressing component 22 ensures uniform force distribution between itself and the grate disc 5, preventing excessive localized stress that could cause damage.

[0026] Preferably, the annular boss 211 is disposed at the bottom of the inner deformable component 21, and the top of the inner deformable component 21 is provided with a plurality of openings 212 communicating with the internal cavity of the annular boss 211. Specifically, the cavity inside the boss is an annular cavity, and the cross-sectional shape of the cavity is a rectangle corresponding to the cross-sectional shape of the annular boss 211. The openings 212 are arranged in a circumferential array on the inner deformable component 21. In this embodiment, the freezing medium is a low-boiling-point, easily vaporized and volatile liquid such as liquid nitrogen. After the freezing medium is added to the cavity inside the annular boss 211, the freezing medium vaporizes and absorbs heat, causing the inner deformable component 21 to cool down. The vaporized freezing medium is discharged from the openings 212.

[0027] Preferably, the outer extrusion component 22 includes, from top to bottom, a connecting flange 221, a sleeve 222, and an extrusion flange 223. The outer extrusion component 22 is bolted to the inner deformable component 21 via the connecting flange 221, and is fitted onto the annular boss 211 via the sleeve 222 with an interference fit. The extrusion flange 223 is used to connect to the toothed disc 5. Specifically, in this embodiment, the inner deformable component 21 is a closed flange structure, and an annular boss 211 is provided at the bottom of the inner deformable component 21. The connecting flange 221 on the outer extrusion component 22 is attached to the inner deformable component 21 and connected by bolts. The sleeve 222 of the outer extrusion component 22 is fitted onto the annular boss 211 and has an interference fit with the annular boss 211. The outer edge of the extrusion flange 223 at the bottom of the outer extrusion component 22 is used to engage with the stop of the toothed disc 5.

[0028] Preferably, the workbench includes a support plate 11, a plurality of support columns 12 disposed on the support plate 11, and a hanging plate 13 disposed on the support columns 12. A centering sleeve 14 for connecting the compressor rotor is detachably disposed on the support plate 11, and the telescopic mechanism is connected to the hanging plate 13. Specifically, in this embodiment, a support base column 15 is also disposed at the bottom of the support plate 11, and three support columns 12 are evenly connected to the edge of the support plate 11 by bolts. Correspondingly, the tops of the three support columns 12 are bolted to the edge of the hanging plate 13. A grooved threaded through hole is disposed at the center of the support plate 11, and the centering sleeve 14 is bolted to the grooved threaded through hole. The centering sleeve 14 is bolted to the compressor rotor. When connecting compressor rotors of different sizes, centering sleeves 14 of different sizes are used. The grooved threaded through hole allows the bolts to be adjusted to accommodate centering sleeves 14 of different sizes.

[0029] Preferably, the telescopic mechanism includes a screw 231 and a wrench 232. The hanging plate 13 has a telescopic hole, the screw 231 passes through the telescopic hole, and the wrench 232 is threadedly connected to the screw 231. The wrench 232 is located at the top of the hanging plate 13, and the bottom end of the screw 231 is connected to the inner deformable component 21. Specifically, in this embodiment, the telescopic hole is located at the center of the hanging plate 13, and the telescopic hole and the centering sleeve 14 are located at the same vertical position. A first plane is axially arranged on the screw 231, and correspondingly, a second plane is arranged in the telescopic hole corresponding to the first plane. When the screw 231 moves axially within the telescopic hole, the first plane and the second plane cooperate to prevent the screw 231 from rotating circumferentially. A flange is provided at the bottom end of the screw 231, and the flange is bolted to the inner deformable component 21.

[0030] When using the telescopic mechanism, turning the wrench 232 causes the screw 231 to move axially through the threaded engagement, which in turn drives the inner deformable part 21 to move axially.

[0031] Preferably, the refrigerant filling device 3 includes a refrigerant storage 31, a filling pipeline 32, and a one-way pump 33. The two ends of the filling pipeline 32 are respectively connected to the conduit 4 and the refrigerant storage 31, and the one-way pump 33 is disposed on the filling pipeline 32. In this embodiment, the one-way pump 33 includes a pump body and a motor, and the motor drives the pump body to pump the refrigerant into the conduit 4.

[0032] Preferably, the refrigerant filling device 3 further includes a controller 6, which is electrically connected to the one-way pump 33. Specifically, in this embodiment, the controller 6 can be an industrial computer, PLC, microcontroller, etc. The controller 6 is electrically connected to the motor of the one-way pump 33 to control the rotation speed of the one-way pump 33, thereby controlling the flow rate and filling amount of the refrigerant.

[0033] Preferably, a filter 34 is installed on the filling pipeline 32 between the refrigerant storage 31 and the one-way pump 33. A flow regulator 35 and a safety valve assembly are sequentially installed on the filling pipeline 32 between the one-way valve and the conduit 4. The flow regulator 35 is electrically connected to the controller 6. The filter 34 filters the refrigerant entering the one-way pump 33 to prevent impurities from damaging the one-way pump 33. The flow regulator 35 is electrically connected to the controller 6, and its flow control is more accurate than direct control of the one-way pump 33. The controller 6 controls the flow regulator 35 and the one-way pump 33 to more accurately control the flow rate and filling amount of the refrigerant.

[0034] Preferably, the safety valve assembly includes an overflow valve 37 and a shut-off valve 36 arranged in parallel. This is used for safety protection and pressure control during the refrigerant filling process. When the pressure of the refrigerant in the filling pipeline 32 is too high, it is discharged through the overflow valve 37 to ensure safety.

[0035] Preferably, the filling pipeline 32 is equipped with a venting structure via a tee connector at one end near the conduit 4. The venting structure includes a venting valve 38 and a venting port 39 connected in sequence. After the refrigerant is filled, some refrigerant remains in the filling pipeline 32. This portion of the refrigerant will heat up and vaporize, and needs to be discharged in time. This portion of the refrigerant is vaporized and discharged through the venting valve 38 and the venting port 39.

[0036] The above description is merely a preferred embodiment of the present invention and does not constitute any limitation on the present invention. Any person skilled in the art can make many possible variations and modifications to the technical solution of the present invention, or modify it into equivalent embodiments, without departing from the scope of the present invention. Therefore, any modifications, equivalent changes, and alterations made to the above embodiments based on the technology of the present invention without departing from the scope of the present invention are within the protection scope of the present invention.

Claims

1. A toothed disc expansion and disengagement device, characterized in that, include: A workbench, used to mount and fix the compressor rotor; A drawing device, comprising an outer pressing component (22), an inner deforming component (21), and a telescopic mechanism, wherein the inner deforming component (21) is connected to the worktable via the telescopic mechanism, and an annular boss (211) is provided on the inner deforming component (21). The annular boss (211) has a cavity inside, and the outer pressing component (22) is sleeved on the annular boss (211) and has an interference fit with the annular boss (211). The outer pressing component (22) is used to connect to the toothed disc (5). A refrigerant filling device (3) is connected to the cavity inside the annular boss (211) via a conduit (4); The annular boss (211) is located at the bottom of the inner deformable component (21), and the top of the inner deformable component (21) is provided with a plurality of openings (212) that communicate with the internal cavity of the annular boss (211). The outer extrusion component (22) includes, from top to bottom, a connecting flange (221), a sleeve (222), and an extrusion flange (223). The outer extrusion component (22) is bolted to the inner deformation component (21) through the connecting flange (221) and is fitted onto the annular boss (211) through the sleeve (222) with an interference fit. The extrusion flange (223) is used to connect the toothed disc (5).

2. The toothed disc expansion and disengagement device according to claim 1, characterized in that, The workbench includes a support plate (11), a plurality of support columns (12) disposed on the support plate (11), and a hanging plate (13) disposed on the support columns (12). A centering sleeve (14) for connecting the compressor rotor is also detachably disposed on the support plate (11). The telescopic mechanism is connected to the hanging plate (13).

3. The toothed disc expansion and disengagement device according to claim 2, characterized in that, The telescopic mechanism includes a screw (231) and a wrench (232). The hanging plate (13) is provided with a telescopic hole. The screw (231) passes through the telescopic hole. The wrench (232) is threadedly connected to the screw (231). The wrench (232) is located at the top of the hanging plate (13). The bottom end of the screw (231) is connected to the inner deformable component (21).

4. The toothed disc expansion and disengagement device according to claim 1, characterized in that, The cryogenic medium filling device (3) includes a cryogenic medium storage device (31), a filling pipeline (32) and a one-way pump (33). The two ends of the filling pipeline (32) are respectively connected to the conduit (4) and the cryogenic medium storage device (31), and the one-way pump (33) is installed on the filling pipeline (32).

5. The toothed disc expansion and disengagement device according to claim 4, characterized in that, The refrigerant filling device (3) also includes a controller (6), which is electrically connected to the one-way pump (33).

6. The toothed disc expansion and disengagement device according to claim 5, characterized in that, A filter (34) is provided on the filling line (32) between the refrigerant storage (31) and the one-way pump (33). A flow regulator (35) and a safety valve assembly are provided on the filling line (32) between the one-way valve and the conduit (4). The flow regulator (35) is electrically connected to the controller (6).

7. The toothed disc expansion and disengagement device according to claim 6, characterized in that, The safety valve assembly includes a relief valve (37) and a shut-off valve (36) arranged in parallel.

8. The toothed disc expansion and disengagement device according to claim 4, characterized in that, The filling pipeline (32) has a venting structure at one end near the conduit (4) via a tee connector. The venting structure includes a venting valve (38) and a venting port (39) connected in sequence.

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